Belt sander



Oct. 28, 1958 'J. w. 'EDGEMOND, JR., ETAL' 2,857,717:

BELT SANDER Filed Nov. 4, 1955 4 Sheets-Sheet 1 I k r I :2 N 1 Q Q a? FM ['1 m M I m I V & l L L,

a -lg I m M h L- A I I A ll 3 g H o L INVENTORS Q JOHN WEDGEMONQJE. N i m I T 1 1| JOHN J. O'CONNOR m M "N QQ & $03 BY y N 7 Z Z Oct. 28, 1958 J. w. EDGEMOND, JR.,' ET L 2,357,717

BELT SANDER Filed Nov. 4, 1955 4 Sheets-Sheet 2 FIE INVENTORS JOHN l/V.D6EMOND,JR JOHN J. O'CONNOR we -W i2; 2 Q9 Z 72 ATTR/VEYI Oct. 28, 1958 J. w. EDGEMOND, JR., ErAL 2,857,717

BELT SANDER Filed Nov. 4, 1955 4 Sheets-Sheet 3 -27 INVENTORS /02 JOHN w EDGEMOND, JR

JOHN J. O'CONNOR ATTORNEYS Oct. 28, 1958 J. w. EDGEMOND, JR.,-ETAL 2,857,717

BELT SANDER 4 Sheets-Sheet 4 Filed Nov. 4, 1955 IN VEN TORS JOHN w EDGEMOND, .1: JOHN J. o'c ONNOR i y- 9.4

' ATTOENEYJ' United States Patentt),

BELT SANDER Johfiwa Edgemon'd, Jr., Los Altos, and John J. OConnor,

Palo Alt0,- Calif., assignors to MagnaPower Tool Corporation', acorporation of California 1 Application November 4, 1955, Serial No; 544,996

'Claims. (CL- 51 -135) I useof devices of'this kind and it is our object to make.

animproved belt sander in which certain of the disadvantages'of prior devices are eliminated and overcome.

In the past, for'example, where belt sanders have been used, it has been considered desirable to permitthe same to be positioned in a variety of working positions and generally these devicesl'havebeen' mounted infsuch a manner that they may belswung'from. the position in which'the 'sandingsurface is substantially horizontal "to a pastries-in which'the'sanding'surface is vertical,"-

It is an object of this invention to 'providea newtrunnion lock ib'oltiwh'ere'in the apparatus is adjustable from one position to another independent of the tension of' thelocking ,device.

It is anobj'e'ct 'ofthis invention to provide meanswfor.

eliminating over-loosening offthe trunnion with resulting sloppiness between therigid base and the movablesander. whenlth'e locking member is '-rele'ased to. permit. movemerit of the sanderzwith respect to the base.

Substantially all belt sanders have a table-like support immediatelymnderlying. the sanding, belt andiin. some prior constructions, ,dust .has tended. to accumulate in the sandingfsurface of the 'belt anddecrease the efficiency ofath'e' belt.

Itis an object of this'invention to provide-.a table which underlies the upperoroperating .run of .thesanding-belt and to. provide therein. a plurality of recesseda portions,.because we have found .thatwhen a:belt-p asses' oven an area of .non-support-the .dust tends. to. bedischarged Prior tbelt' sanders havesalso provided a table on or against zwhichathe .work .piece may be -supp orted.-'-

It..is .an. object ofthis 1' invention to 'provide awtable whichtalsozopera tes-as a fence and which-(may beset-at selected positions acrosswtheoperating surface of the: belt-sortwhichamay be placed-=on---either sider-thereof. Moreover we have provided a table which not-"only a act's v as ..at fence,. but have provided a rmeansltherefor to :ac

commodate either a single or double mounting.

It :-has,n of :course,r.always'fbeen necessary to provide I some means 'of mounting the endless b'elt upon thede-' vic'e randfmaintaining prope'r 'tension upon the belt once it has been loadedu v 7 his an-objctof this inventionto provide an automatic tensionirig device in connectidn" with one ofthe pulleys;

which. is independent from the belt tracking adjustments whereby thejbeltwill alwayslbe kept npropertension and' a'ls'o' for Sthe' purposetof permitting substantiallydn 2,857,717 Patented Oct. 28, g

ice

2. stantaneous.removal and replacement of the sar i'dingb without aflfectihg'tracking' adjustments. Such a tensi ing device'is also desirable to prevent overloading o drive andto'compensate for different lengths of ori'ginal belts and differences in'stiffnes's and flexibilityaseach belt is used. v 7

Other objects and advantagesof'our invention "11 appear from the following specification taken" in'f'con junction with the accompanying drawings which: Figure 1 represents'a view' 'of our'beltsander'mounted in substantially vertical position" upon the] end of'the, Combination PowerTooldisclo sed" in Edgemon'd et application, Serial No. 494,468 on March 15}. 1955' Figure 2 represents an enlarged cross 'sectiona'l' detail: taken along'the line"22of'Figuiref 1" andillust'ratesthf' meansot holdingj'the "two side framemembersbfiour? device in predetermined spaced. relationship; v

Figure 3 is an enlarged cros's sectional detailtali""" along the line 33 of Figure? and illustrates the In ner' in'which the" table-which supports the up er-"b operative run of the sanding beltis secured to the framef" Figure 4 is'a' side'view of our'belt sander. in'verticaloperating posit-ion and illustrates, in dotted line position; the general position of thesame when in. ho rizon'tal" operating position; i v Figure 5 is a fragmentary. view of the'lupperendof" the'beltsander'when in'v'ertical pos'ition'with th'ebe'lt removed showing the table"Which-supports th'e' operat' ing run of the sanding b'eltv and" also p'artiallyfshowir ig the idler pulley over which the'sanding'belt 'p'asses"andwhich is maintained undertons'tantjautomatic terisi'on'jrj Figure 6 is afragrnentary'cross sectional detailta'k fi along the line 6-6 of Figure 4 and illustrate's'the'a'uto? matic tensioning device and the means for manning;-

the idler pulley; V

Figure 7 is a cross-sectionaldetail taken alongfthe line 77 of Figure 6'; V

Figure 8 is acrosssectional detail taken along,the" line 8 8 of Figure 6'and illustrates the construction =o 'f the control knob and ratchet release mechanism for the automatic tensioningmechanis m illustratedin Figure 6;. Flgure 9 is a'side view of oursander showingthe 'i same in horizontalworking position;

Figure 10 is a view, partly' in cross-section, taken along Q the line 1010 of Figure 9 and showing .the drive pulley over which the sanding ,belt is raised; and

Figure 11 is an enlarged view of the trunnion lock,

bolt mechanism.

tool illustrates a preferred'e'nvironment and'mountingqit mustbe understood that our device-may be mounted for;

separate operation upon'a stand' of its own and be driven:-

with an independent motor.

As is pointed out 'in the above] identified-Edgemond" et a1. application, the combination tool includes a pair} of opposed identical stool bench ends 10 and 11' whichsupport castings 12 andj13. The'castings'lz and 13 fac commodate parallel longitudinally extending: tubes t The tubes 15 are supported at one end byatcas tingzlfa'and at their other ends are supp'o'rted'by a casting 1251 which.

- may be clamped to casting 12 thereby providing alsturdy s rigid bench or supporting member.

The end casting 12 is provided with a pair of parallel spaced vertical sockets Which are adapted torece'ive' a pair of spaced parallel'mounting'tube's 16'and"17 wh os"et other 'en'dsare received in similar"recesses'infafrnefriber 18'Lw-hich :forms the mounting-base for our belt sander.

Thespara'llel' tubulanwa'ys 1'5provide a mounting for a headstock member indicatedgenerally -a't- 19' w en su15-" ports an electric motor which is operatively connected to the power take-off shafts 21, 22 and 23, each of whose purposes has been previously described in the aforementioned Edgemond et al. application. We provide a driven shaft 24 which is adapted to be coaxially' aligned with the power take-off shaft 23 and to be operatively connected thereto by means of a coupling member 26.

It is apparent that our device can be suitably mounted in any suitable base which is provided with spaced parallel cylindrically shaped sockets which are adapted to accommodate the mounting tubes 16 and 17 and which is further provided with a motor and means for operatively connecting the same to the driven shaft 24.

Generally speaking, our sander consists of a base member 18 to which a side frame member 27 is pivotally secured by means of an arcuate trunnion construction illustrated in Figures 9, l and 11 Similar member 28 is secured in spaced parallel relationship to member 27 which forms another side member of the frame assembly 29 of our device. The frame assembly 29 supports a generally cylindrical driving pulley 31 and a driven adjustable pulley 32 over which a sanding belt 33 may be positioned. The frame assembly 29 also supports the fence or table assembly 34.

As indicated particularly in Figures 2 and 6, the side frame members 28 and 27 are held in predetermined spaced relationship by a pair of tubular spacers 36, only one of which is shown, and a pair of bolts 37. Members 27 and 28 are provided with machined shoulders against which the tubular spacers 36 abut. The head of the bolt 37 and the nut 38 engage the members 27 and 28 and complete a rigid frame assembly 29 for our sander.

The frame assembly 29 is pivotally mounted on the base 18 in the following manner: Member 18 is provided with an arcuate slot 42, which accommodates an insert 44. The exposed face of insert 44 forms an arcuate slot in which arcuate plate 46 is radially slidable as shown in Figures 9 and 11. Plate 46 is maintained in fixed position on the frame member 27.

The frame member 27 has a fiatted hole to accommodate and key a bolt 47. Base 18 and insert 44 are provided with an arcuate slot 48 in which the bolt 47 slides as the sander is swung about the axis of the shaft 24. The bolt 47 is threaded at 49 and is provided with a washer 51 and a tension nut 52. Its other end is also threaded and is provided with milled flats fitted to washer 53 and fiatted hole in frame assembly 29. A similarily threaded knob 51 completes the assembly.

Operation of the trunion lock bolt device may briefly be described as follows: The nut 52 is customarily tightened to a point at which the washers 51 and 53 frictionally engage the cooperating surfaces of the base 18 and the frame 29. When the knob 57 is loosened it Will become disengaged from the washer 53 and, since the nut 52 is adjusted to provide only light frictional engagement of the r washers 51 and 53 with the members 18 and 29, out belt sander may be swung from vertical to horizontal position and back about the axis of the member 24 on the trunnion and track assembly previously described, without members 18 and 27 separating excessively. When our sander is in the desired position, however, the member 57 may be rotated into engagement with the washer 53 thereby increasing the frictional engagement of the washer 53 and the member 29 so that the same will be held in that position. As previously pointed out when the member 57 is retracted and no longer engages the washer 53 our sander may be swung to another desired position. Once the member 57 and the washer 53 are in tight frictional engagement, however, movement of our device is prevented.

The lower ends of the frame members 27 and 28 support roller bearing assemblies 58 and 59 which accommodate the driven shaft 24 upon which the driving pulley 31 is mounted. The driving pulley 31 may be secured to the shaft 24 in any suitable manner as by being keyed thereto, for example. As indicated in Figures 1 and 10 the shaft 24 is exposed to both sides of the device and is adapted to be driven from either end.

The frame members 27 and 28 also support a tablelike member 61 which is secured to them along its side edges and which, as viewed in Figures 2 and 5, is provided with spaced grooves 62. The member 61 forms a support immediately underlying the upper or operating run of the sanding belt 33. The slots or grooves 62 provide areas of non-support under the belt and dust which would normally accumulate in the grits of the belt is discharged therefrom by flexing of the belt at those nonsupport areas.

The side frame members 27 and 28 are also provided with a plurality of sockets 63, 64, 66, and 67. As illustrated particularly in Figures 1, 9, and 10, the sockets 63 and 64 are adapted to receive mounting tubes 68 and 69 of our table construction. The sockets 66 and 67 are adapted to receive the tubes 68 and 69 in the same manner. However the pairs of sockets 63 and 66 and 64 and 67 in the side frame members 27 and 28 are also spaced the same distance apart and are adapted to receive the mounting tubes 68 and 69 so that our table assembly 34 may operate as a fence as shown in Figure 1. The tubular members 68 and 69 are adapted to be held in the respective pairs of sockets in any suitable manner, and, for example, I have shown them held by means of threaded members 71 which cooperate with threaded orifices in the frame members 27 and 28 and which are adapted frictionally to engage the members 68 and 69 and hold them in pre-determined position in the selected socket.

The tubular members 68 and 69 support a cross head member 72 to which a table 73 is pivoted at point 74. The member 72 is also provided with a pair of parallel extending arms 76 and 77 which accommodate a cross.

bolt 78. Adjusting arms 79 and 81 which are pivotally connected to the table 73 at 82 are provided with slots 83. Cross bolt 78 passes through the slots 83. The bolt head 84 of the cross bolt 78 engages in slot 83 in member 81 and the adjustable nut 86, having a handle 87,. the

nut 86 being threadedly mounted upon the cross bolt 78, releasably engage the arms 79 and 81. Thus, when the table 73 is pivoted about point 74, it may be retained in any predetermined position when the nut 86 is tightened. It is apparent, therefore, that the table 73 may be swung to any of a number of positions as, for example,

the position illustrated in Figure 4 to a vertical position as illustrated in Figure 9. It may be swung to either posi tion while it is being utilized as a table as indicated in Figures 4 and 9 or as it is being used as a fence as indicated generally in Figure 1.

Operation of the table fence may briefly be described as follows: When the operator has determined whether the device is to be operated as a table or a fence he positions the mounting tubes 68 and 69 in the appropriate sockets 63, 64, 66 and 67. The members 71 are then tightened so that the tubular members 68 and 69 are locked in a predetermined position to properly space the table 73 from the upper run of the belt 33. The table members 73 may be pivoted about the point 74 to a desired angle with respect to the upper run of the belt 33 when the nut 86 is loosened so that the members 79 and 81 are free to slide with respect to the bolt 78. However when the member 86 is tightened the member 73 will be retained in that predetermined fixed position. The proper positioning of the member 73 away from or toward the upper or operating run of the belt 33 may, of course, be determined by moving the entire assembly upwardly or downwardly with respect to the frame 29. When the desired location has been reached the member 71 may be tightened. The entire assembly can be removed from the device when desired.

The means for retracting the driven pulley 32 so that a belt 33 may be removed therefrom and a new belt positioued thereon is illustrated particularly in Figures 6, 7

and 28:- These, zfigures. ialso.illustrate .zthe automatic ten sioning ;.-.means which urgespthe. pulley.32 .rupwardly, as

viewed in Figure 6, whereby proper. tension maybe main: tainedon-thebelt33;. H v i As shown in .Figures 6 .and ;7 .the. side .frameunembers 27 and '28-:are. provided withr identical-.-pa rallel.-spaced ribs 91 and. 92. which .maybetormed integrally ,therewith when the members-27 and .28.are cast... A pair of identical blocks 93a and. -93b.. are..- slidably mounted .-inthe longitudinal recesses. formed byj the-.ribs 91% and .92 and are adaptedtto slide longitudinally withrespectthereto. The

determined position by, the; nut: .101 .which .is -threadedly, mounted .thereonand which. is adapted :.to..be,.urged..into

tight frictionalengagement with. onerside of "the,.b0ss..99.

The ..member.98 is similarlylmountedin a..similar..st-ud.

99a and is adaptedto be moved longitudinallybye wheel.

102.which is threaded thereto. ,.The .drivendrum. pulley. 32 is rotatably,mounted.Iupon:the-tubular..axle 94.as -by, means. of bushings .103. .A'thandle' .104-.is..mounted..on. and keyed to the axle 94.' The handle,.104 is. provided with a pawl-likemember .106 which. is pivoted thereto as at 107 [and whose operative portion 108Lis .adapted to en gage a slot inmember 95., The ipawl .108 [is normally urgedinto engagement withtheslot in member 95 by.

the spring 110. I

The tubular axle 94also accommodates "a spring 111,.

one end of which is secured to a stub shaft 112'wh'ich' is.v

keyed to the block-93b by a pin 113 which engages. the

collar 95 on member 9312." Theother end ofthe spring.

111is secured to a stub'shaft '114 which .is keyed ft'o'the axle 94. Thus we providelamassemblyconsisting of.-the.

axle 94 and the two cams 96Tand the; stub shaft. 114 which rotate as a unit withinthe block's 93 The block 93bv and the member 112iengaged by pin 113"a'lso form a unit and thesetwo units are operativelyconnected by the spring 111. Thus torsion on the springlll' will'be transmitted through the shaft .114"ajnd. theaxle 94 to the.

cams 96 urging them into engagement with" the members 97 and 98. As indicated in Figure 7 this will. tend. to urge the axle 94 upwardly as viewed in Figures 6 and 7. However by operation of the handle 104 the earns 96 are rotated to .the flat on the cams; :Withaathe result that the axle- 94'-and:the drum .32. will .be broughtdownwardly as viewed :inFigures 6 and 7..

Operation .of the device may. briefly:..'be described-Jas followsz. Let-it be assumed the belt1i333is newt.-.As.is known, new belts are stifi. In .our device-pulley 32Twillb'e urged upwardly into positions .illustratediin Figures..6i'and 7 by vir-tuenof the effect of the .tOIqllBrOf-lthfi spring: 111 on the caxle 94, and thus on the-:cams.;-:96, with a. force sufficient to produce driving friction of the pulley 31 on the stiff belt 33 without producing an overload on the driving mechanism 19 as shown in Figure 1. Then let it be assumed that as the belt 33 wears it stretches. The same torque of the spring 111 turns the cams 96 to urge the pulley 32 upwardly to compensate for this wear and stretching of the belt 33. Then let it be assumed that the belt 33 has become worn and must be replaced. By operating the handle 104 counterclockwise until the pawl 108 drops into the slot in member 93a due to the force exerted by spring 110 the cams 96 will have been rotated to their flat or low areas as viewed in Figure 7 with the result that axle 94 and the blocks 93a and 93b may be moved downwardly as viewed in Figure 7. The belt 33 may then be removed. While the pulley 32 is in this retracted position a new belt may be put on the device. The handle 104 may then be released by depressing member 106 and thus lifting pawl 108 as viewed in Figure 8 in which event the torsion of the spring 111 will tend to rotate the knob. 10.4 and .the axle: 94 with ,thescarns 9 6-.a s. viewed in.Figure 7 with. theresult thatthepulley 32 will e moved upwardly asviewed in Figures6. and:7..= The merry... ber.111 is a torsion-spring, -Initial. torqueload isapplied. by turning ,handle 104 counterclockwise: with belt 33..re-. moveduntil the .desiredloadis reached. Thus .thetorsion. of spring .111 maybe varied, ;Inadditionthe amount of rise.of.the.uniform rise .cams 96..permits accommodation;

of different lengthsof belts on the same device. 7

It will benotedlhat. Wehave .alsoprovided means for adjustingthe members 97 andfl98against which the cams 96b'e'ar. For example,- the member 97 may ..be',pre-set at the. factory or .at any .timewhen '.the .belt.33.i's removed. The member 97 may be slid longitudinally .with respect to. theboss 99 and .heldin a predetermined position..by.the Rotation ofmember 101 is prevented, .by

member 101. trapping .it in a pocket cast inthe sidememben adjacent the top. of .the member 99. In. order .-to prevent rotation. of the member .97we have provideda pin,116.which slides inthe slot member 117 as the member 97 .is,,moved,up: lwardly 'ordownwardly. Asimilar. pin.116a..reciprocates.;. in a similar slot 117a and prevents rotation of the member.

98 when the. member-.102. is rotated. .By proper positioning ,of .th'ernembers .97 Iand.98.the ]belt-33 may be centered. with respect to the. pulley 32.

Member 102 .is externally adjustable .to .permit adjust. ment of -belt centering .or tracking. While. .the machinejs in operation.

As the belt 331accommodate itself tothepulleys, the. spring 111 will urge the pulley 32 upwardly and maintain.

propertension on the belt forcorrect .drive. Moreover,

when the earns '96 are actuated the belt setting determined.

by adjustment of members 97 'and98 -is not disturbed.

Thus we have, provided a simple; device'which'. prevents overloadi'rig of the drive yetwhich maintains suflicient;ten-- sion'on the belt at.all, timesv to insure driving of lthebelt by .the pulley .31.. We havealso. provided a resilient sup port to take up or compensate forbelt stretch.;or,accom-. modation of the belt to the device as it weansor becomes pairbf pulleys are rotatably mountedin a frame, one of: said pulleys being mounted inbearings which'are fixed in said frame, the other. of said pulleys being mounted on a. hollow axle. supportedin blocks which are slidably mounted in said frame, a torsion springin said 'axle; one

end of said spring being. operatively connected .to. one .of. saidblocks and theother Cl'ldcOf saidspringrbeing operatively connected to said axle, a pair of cams .fixed:on said axle. which are adaptedtoengage. said .frameand to releasably lurge said.axle and fsaidblocks. in a predetermined direction alongsaid. frame- 2. Ina device .of .the.,characterz'described in: which a sandlng b'elt. is .supportedby pulleys. supportedjn a-.frame,-.

one of said pulleys being mounted in bearings which are fixed in said frame, the other of said pulleys being rotatably mounted on an axle which is rotatably mounted in blocks, said blocks being slidably mounted in said frame, a torsion spring in said axle, one end of said spring being secured to one of said blocks and the other end of said spring being operatively connected to a pair of cams which are fixed on said axle and adapted to engage said frame whereby when said cams engage said frame said blocks and drum are urged to a position remote from the other ofsaid drums.

3. In a belt sander construction, a sanding belt, a frame, a pair of pulleys associated with said frame and adapted to support said sanding belt, a pair of blocks slidably mounted in said frame, an axle rotatably mounted in said blocks, one of said pulleys being rotatably mounted in said axle, cam means fixedly mounted on said axle and adapted to engage said frame, the position of said blocks being responsive to the rotation of said cam means, means for rotating said cam means consisting of a torsion spring, one end of which is fixed to one of said blocks and the other of which is operatively connected to said axle, and handle means on said axle whereby the effect of said spring may be overcome and said axle and said blocks be moved in a direction opposite to that in which the same are normally urged by said cam means under the influence of said spring.

4. In a belt sander construction, a sanding belt, a frame, a plurality of pulleys adapted to support said sanding belt, an axle slidably mounted in said frame, a pair of cams fixedly mounted on said axle and adapted to engage said frame, means for rotating said cams, said axle being responsive to the rotation of said cams, means for rotating said cams consisting of a torsion spring one end of which is in operative engagement with said frame and the other of which is fixed to said cams, and means connected with said axle whereby the effect of said spring may be overcome and said axle moved in a direction opposite to that in which the same are normally urged by said spring.

5. In a belt sander construction, a sanding belt, a frame, a plurality of pulleys adapted to support said belt, an axle supporting one of said pulleys and movably mounted in said frame, a pair of cams fixed on said axle, adjustable means on said frame adapted to be engaged by said cams, means for rotating said cams consisting of a torsion spring one of whose ends is in operative engagement with said cams.

6. In a belt sander construction, a sanding belt, a frame, -a plurality of pulleys adapted to support said belt, an axle supporting one of said pulleys movably mounted in said frame, a pair of cams fixedly mounted on said axle, said axle being responsive to the rotation of said cams, adjustable means on said frame and adapted to be engaged by said cams and means for rotating said cams consisting of a torsion spring one of whose ends is in operative engagement with said cams.

7. In a device of the character described in which a pair of pulleys are rotatably mounted in a frame, one of said pulleys being mounted in bearings which are fixed in said frame, the other of said pulleys being mounted on a hollow axle supported in blocks which are slidably mounted in said frame, a torsion spring in said axle, one end of said spring being operatively connected to one of said blocks and the other end of said spring being fixedly connected to said axle, a pair of adjustable members mounted on said frame, a pair of cams fixed on said axle adapted to engage said adjustable members and to releasably urge said axle and said blocks in a predetermined direction along said frame.

8. In a belt sander of the type in which a sanding belt is mounted upon pulleys which are supported in a frame assembly, a pair of similar parallel side members forming a portion of said frame assembly, each of said side members being provided with a plurality of sockets, the

sockets in each of said 'side members being parallel to the path of movement of said belt and opposite pairs of sockets-on opposite frame members being at right angles to said path, all of said sockets being so formed that the distances between their centers are equal, a table construction comprising a table and a pair of mounting tubes, means ,for tilting said table with respect to said mounting tubes, means associated with said sockets to lock said mounting tubes in a predetermined position in said sockets whereby the position of the edge of said table adjacent said belt may be adjusted in accordance with the tilt of said table.

9. In a belt sander of the type in which a sanding belt is mounted upon pulleys which are supported in a frame assembly, a pair of similar parallel side members forming the sides of said frame assembly, each of said side membersheing provided with a plurality of sockets, the sockets in each of said side members being parallel to the path of movement of said belt and opposite pairs of sockets on said frame members being at right angles to said path, a table construction comprising a table and a pair of mounting tubes, means for tilting said table with-respect to said mounting tubes, set screws associated with said sockets to lock said mounting tubes and said table in a predetermined position in said sockets, whereby the position of said table with respect to said belt may be adjusted.

10. In a belt sander of the type in which a sanding belt is mounted upon pulleys which are supported in a frameassembly, a pair of parallel side members forming the sides of said frame assembly, each of said side members being provided with a pair of sockets, the pairs of sockets in each of said side members being parallel to the path of movement of said belt and opposite pairs of sockets in said frame members being at right angles to said path, a table construction comprising a table, a frame for said table and a pair of tubes, a table being tiltable with respect to said frame, the pair of tubes adapted to engage selected pairs of said sockets, the tubular members being adapted to be engaged in said sockets in a predetermined position whereby the position of the edge of said table adjacent said belt may be set at a predetermined distance from said belt regardless of the degree of tilt of said table.

References Cited in the file of this patent UNITED STATES PATENTS Heesemann May 29, 1956 

